Molding apparatus



Sept. 22, 1925. 1,554,402

F. W. BURGDORFER ET AL uowme APPARATUS Filed Aug. 2.7, 1921 2 Sheets-She. l

Sept. 22., 192 5.

' F. w. BURGDORFER ET AL MOLDING APPARATUS 2 u e e h s s t e m z Patented Sept. 22, 1925.

UNITED STATES 1,554,402 PATENT OFFICE.

FREDERICK W. BuaGnoRrER AND EDWARD F. RODDY, or ST. LOUIS MISSOURI.

MOLDING APPARATUS.

Application filed August 27, 1921. Serial No. 496,030.

To all whom it may concern:

Be it known that we, FREDERICK W. BURG- DORFER and EDWARD F. RODDY, citizens of the United States of America, and residents of the city of St. Louis and State of Missouri, have invented certain new and useful 'Im provements in a Molding Apparatus, of which the following is a specification.

This invention relates to a molding apparatus, and has forits primary object the purpose of providing improvements in that class of apparatuses known as pattern stripping machines.

Another object of the invention is to' provide an improved arrangement of pattern stripping parts in the molding apparatus,

A further object of the invention is to provide an improved molding'apparatus for forming the mold or impression in the sand flask as the flask in passed thereunder.

A still further object of the invention is to provide an improved combination of a sand pressing element and a sand retaining frame, both of which are relevant towards operating on a sand flask in conjunction with a molding apparatus of this improved character.

Other and further objects will appear in the specification and be specifically pointed out in the appended claims, reference being had to the accompanying drawings exemplifying the invention and in which,

Figure 1 is a side elevation of a flask conveying device showing this improved molding apparatus in operable relation thereto.

Figure 2 is an enlarged vertical section taken through this improved molding apparatus.

Figure 3 is an enlarged vertical section similar to Fig. 2, but showing the patterns of the apparatus in the act of being molded or impressed within the packed body of the sand flask.

Figure 4 is a bottom plan view on a reduced scale of Fig. 2.

Figure 5 is a horizontal section taken on a reduced scale on the line VV of Fig. 2.

Figure 6 is a horizontal section taken on a reduced scale on the line VI-VI of Fig. 2.

\Vith reference to the accompanying drawings, this improved molding apparatus is comprised of a rectangular body portion 1, having vertical walls 2 and a bottom plate 3, said walls and bottom plate forming a closure 4, and extending upwardly from said bottom plate is a plurality of pins 5,

each supporting a coil spring 6, each of said springs at their lower end being seated against a boss 7.

Movably mounted within the'closure4 is a top plate 8, which is provided a plu- I rality of spring seats 9, each'beingforthe' reception of theupper end of a respective coil spring 6, and formed in each of said seats is a "ertical bearing 10, each beingfor top plate- 8 is adaptedto abut by pressure of the springs 6"thereagainst Thetop plate 8 serves as a. pattern supporting plate, and from the disclosureof the drawings, circular patterns are provided,

and in this instance designate piston ring patterns 14, each patternat its upper end being provided with a series of'securing jaws through whichthe bolts 16 are passed-for securing them in suspended positions to the underside of the top plate 8, said patterns being of a lengthwherein when the top plate 8 is in elevated position as shown in Fig. 2, the lower edge-17 ofeach pattern will be flush with the lower face 18 ofthe bottom plate 3.

As disclosed in Fig. 4 of the drawings, four piston ring patterns 14 are shown, and so that each pattern can be depended through the bottom plate 3, circular openings 19 are provided, and located within each pattern is v an insert plate 20. the lower surface of each insert being held'in flush alinement with the lower surface 18 of the bottom plate 3.

For supporting each of the insert plates is a spider 21, each of said spiders being comprised of a series of arms 22, which are formed integral with the upper surface of f the bottom plate 3, the arms of each spider merging into a hub 23, each of the insert plates 20 being suspended from a respective spider hub 23 by a screw 2!.

In order for the piston patterns 14 to be suspended over the insert plates 20 as described, each pattern is provided with a series of vertical extending-slots 25, there being a slot for each of the arms 22 of each respective spider 21, and when each pattern is secured to the underside of the top plate 8, the respective arms of each spider are engaged within respective slots of each piston pattern,

The bottom plate 3 is provided with an annular extending ledge 26, and vertically movable over said ledge' is a sand retaining: frame 27, having an inwardly extending portion 28 which is adapted to seat on said l dg .xixlv Extending to each of the patternsdh is a runner 29, each of said runners leading from a gate 30, said runnerstand garteeither r forming part of said patterns or may be suspended from the top plate 8 :as are said patternswz A molding apparatus of this improved character is to benoperated' above: or adjacent asand flask into which thezpattern is to be rpressedz-fon ttorming the ;mold,-but on account of-the rapidity at which this im-v proved apparatus can; be i operated, .convey-;

ing meansnas ;-'shown. in Fig; l are arranged for bringingin'p flaskswhichcontain mold ing sand:tosthe-iapparatusysaid conveyingmeans also beingdused for removingthe" flasksnafter theimoldingroperationaz In connection with the! aboveaconveying means which is comprisedof an 'endlessbelt ets 32, a standard 33 islmountedon each side ofs'aidbelt, each of said standards supporting-a bearing 34 at its upperend, said standardslebeing: 'secured-itogethen by the tying memberu35, and supported by said bearings is a horizontally I arranged shaft 36, and mounted on said shaft ;is.a pair' of;

cam wheels 37, -eachhaving atcamway 38.- formed sideways thereof, wand mounted in each of said: carnways is arollerg39, each of,

said rollers being'lmounted'ion a respective end of a horizontally extending..shaft 40, said shaft being mounted in bearings 11: whicln are upwardly extended from the top plate '8 of the pattern holding device which istmounted' be tween the-standards 33..

Extending from opposing walls 2 of the i bottom portionfil is a guiding member 42, each guiding member-being vertically slidable on a respective standard 33. Secured-- to one end of the shaft 36 is 'aisprocket 43' from which is mountedzan endless chain 44, said chain being cooperable with a sprocket 45 which is mounted on a shaft -46,and see v cured to said shaft is a spur gear 147 in mesh with an intermediate gear 48 which meshes with the powergear 49 of a motor 5t);

Carried by the endless belts 31-is an apron 51, and arranged bcneathit-he' upper lapofw said apron, intermediate ofits ends and adjacent the standards33,is a table 52.

In the operation of an apparatus ofwthis improved character, -molding sand which is contained in the hopper 53.is allowed to be entrained into aflask fi l-which is mounted: therobeneath on the apron 51, and as-the flask is moved forwardlyv towards the molding or -impressing apparatus,- ifurthezt designated as A, a horizontal levelling element :55rwill level and form an :upper sur- -zelosed: will"! the; U2;v

face Bto thersand within the flask 54, ,Whcn the sand filled flask fi thas" been conveyed to a positiondirectly beneath the molding apparatus A by power; transmitted. from the. motor 50, the flask is arrested in -exact registerj ng z-ppsition by the actuation of intermittent arrestin means such as dis- 1 patent to Fahnestock 1,027,116, and at this point the camways of the camwheels 37-avil1 become7 act-ive;|'on .-tlier rollers:.39; thereby loweringthe apparatus A idownwardlyand the. sand retainingiiramefiliwill beilowered-over the i uppen projecting suntaceB-otthe sa'nd containedfiii .tlimflask!until'ltheulower: edge rd-- becomes atirest: onflthenupper surface 57-01? the flask directlylfltlaerenbeneatlr During further operationuofi. the scam wheels +37 on the rollers-39,1th'e'zbody' :portion :1 :is further- :loweredfaind as'ithe dowveri surface :18 of the bottom plate 3: engages *the raised- :surface B of the sand within the flask, said raised sand surfacez-Br B'Wil]: be: pressed downwardly in Ithe flask randtwhenthensand resistance be- 31 mounted over pairs 0t opposing sprockcomes too} great ffOi the pressure -ofthe springs '6 contained Within the 'closure:4,

said bottom ip-late hand inseit plates 1'20 will be arrested or p'antiallyaa-rrested lay-the sand pressure ofthe flask, and in iwhichthe-topplate :8 will" be forced! downwardly;-towards the bo-ttom plate ;3-',:\thereby:foreing the patterns 114mm, their :runners 129 from the. bottom plate bandtheinsei't platesQO-to moldw-hich'hhavle [been ormed, -and after said patterns have been-withdmawn within the bottom p-late *3 the apparatus a A is moved to-an elevated position by said cam wheelsuj and in which' the;retainingnfna nefli will again-;.-be-suspended from (the IQdge'QG of the bottom plate 4 After the apparatus A has been elevated; the flask bearin-gthe:impressions or molds ofthe patterns is moved. to-the position C from where it 'is removed-from the apron 115 51, and as the flask was moved'to the position C, a succeeding flask which hasbecn tillednwith sand from the hopper 53- is; moved to a position beneath the uplifted apparatus 1L From 'the aforementioned"description of this improved molding" apparatus, on actcount of the apparatus first pressingthe sand into the flask and then molding the patterns and afterwardsremoving the, patterns, it: is obvious that arrapidly molding apparatus is afforded thereby.

lVhat we claim is:

7 1. In a molding apparatus, the-combination of anaouter arranged stripping element, 9:

an annular shaped imprinting element movable therefrom, and an inner arranged stripping element located concentrically of said imprinting element.

2. In a molding apparatus, the combination of a pair of stripping elements, and an annular shaped imprinting element movable therebetween.

3. In a molding apparatus, the combination of a stripping element, an imprinting element reciprocal therefrom, a second stripping element arranged interiorly of said imprinting element, and means for reciprocating said reciprocal element.

4. In a molding apparatus, the combination of a pressing element for engaging the sand in which an impression is to be formed, an impression forming element to be extended from said pressing element, and a second pressing element borne by said other pressing element arranged interiorly of said impression forming element.

5. In a molding apparatus, the combination of a pressing element for engaging the sand in which an impression is to be formed, an impression forming element to be extended from said pressing element, a second pressing element borne by said other pressing element arranged interorly of said impression forming element, and there being means for extending said element.

6. In a molding apparatus, the combination of a yieldingly held sand pressing element, an impression forming element to be extended from said pressing element, a sec ond pressing element borne by said first pressing element arranged interiorly of said impression forming element, and a movable frame depended .from said first -mentioned pressing element.

7. In a molding apparatus, the combination of a stripping plate, means whereby a sand flask can be arranged beneath said plate, an imprinting element movable from said plate into the sand of said flask, and an insert. plate located interiorly of said element movable with said stripping plate.

8. In a molding apparatus, the combination of an outer stripping plate, means whereby a sand flask can be arranged beneath said plate, an imprinting element movable from said plate into the sand of said flask, an inner stripping plate arranged interiorly of said element, and means for op erating said imprinting element towards and away from said flask.

9. In a molding apparatus, the combination of a pressing element, a sand flask to be arranged beneath said element so that the sand contained therein can be pressed by said element, an impression forming element associated with said pressing element to be extended from said pressing element into the sand of said flask, and an insert plate arranged concentric to said impression forming element movable with said pressing element.

10. In a molding apparatus, the combination of a sand pressing element, an imprinting member reciprocal in said element, an insert plate co-operable with said member, means provided for supporting the sand flask in operating alinement with said element, means for reciprocating said member,

and resilient means associated with said pressing element.

11. In a molding apparatus, the combination of a pressing element for engaging the sand in which an impression is to be made, an impression member co-operable with said element, and a movable frame into which said element is to reciprocate.

12. In a molding apparatus, the combinationof a pressing element for engaging the sand in which an impression is to be formed, an impression forming element to be extended from said pressing element, and a reciprocable sand retaining frame into which said element is to reciprocate.

13. In a molding apparatus, the combination of a stripping plate, means whereby a sand flask can be arranged beneath said plate, an imprinting element movable from said plate into the sand of said flask, and a reciprocable sand retaining frame co-operable with said flask and into which said stripping plate is to reciprocate.

14. In a molding apparatus, the combination of a pressing element, a sand flask to be arranged beneath said element so that the sand contained therein can be pressed by said element, an impression forming element associated with said pressing element, and a reciprocable sand retaining frame arranged above said flask co-operablewith said pressing element.

15. In a molding apparatus, the combination of a pressing element for en aging the sand in which an impression is to e formed, an impression forming element to be extended from said pressing element, and a reciprocable sand retaining frame into which said element is to reciprocate borne by said element.

F. W. BURGDORFER. E. F. RODDY. 

